Fuse mounting block



July 11, 1933. G. E. WADSWORTH FUSE MOUNTING BLOCK Filed Jan. 22, 1931 I W EN TOR.

A TTORNEY.

Patented July 11, 1933 1 UNITED; surges a:

GEORGE E. WADSWORTH,-OF ERLANGER, KENTUCKY, ASSIGNOR TO THE ELECTRXC, IiIFG. COIVIPANY, OF CINGINNATI, 0310, A CQRPOBATION OF OHIO Fuss MOUNTING BLOCK Application filed January 22, 1931.. serial no. 510,429.

My invention relates to fuse mounting blocks, and partici'ilarl'y what are technicallykhQWIi as fuse contact bases of the type adapted to receive knife-blade contact type cartridge fuses. i

The usual fuse contact base for receiving a knife blade contact type cartridge fuse comp-rises a mounting block with resiliently mounted clamping jaws providing terminal connections for receivingtlie,blades of the cartridge fuses. If the contact jaws become bent or lose their resiliency by being pried of the contact mounting. Fuses of this. type frequently burn out and cause difficulty due to insuflicient contact, f overcome this dilliculty-r it is old togpro vide detachable clamps which are inserted over the opening in theclamping jaws, and which can betightenedup to exert pressure against the clamping jaws to cause them to firmly gri'pthe knife blades of the fuses. In most fuseboX mountings, the presence of such clamping devices interferes with the closing of the lids of the fuse boxes, or requires such clearance within the receptacle holding the fuse block as to be objectionable. It is the object of my invention to provide a fuse contact base, in which a. clamping device is associated with the jaws which receive the blades of the fuse in such a. manner that the jaws may be forced into position, causing con-- tact with the blades over substantially the entire area of the blades, Another object of my invention is to provide clamping devices which form a permanent part of the fuse contact base.

As the contact jaws which form the terminals receiving the blades of the fuse tend to spring apart at their open ends, it is further my object to provide a clamplng device which exerts a thrust agalnst the open ends of the jaws, thereby causing the blades toseat V in alignment with the walls of the jaws so that thorough contact is established.

The above objects and other objects to which reference will be made in'the ensuing disclosure, 1 accon'iplishby that certain combination and arrangement of parts of which Referring to the drawing: Figure 1"is side elevation of a preferred type of fuse cut outbas'e,'with the clamping device closed. 1 i A 1 Figure 2 is'a plan view of thefuse cut out base in the same position as is-indicated in Figure 1.

Figure 3 is a perspective view of a portion of a fuse cut out base showing one ofthe I have shown a n'eferred embodiment.

contact with the clamping device asconductive anden 'ages the clamping jaw 5 adjacent its upper end.

The clamping aw 42 1s mountedfor movement to and from the clamping jaw 5.

As Et-Pitftieulfitly desirable-clamping arrangen'ient effective on the aw 4:, I have indicated mounting brackets 10, 11 having flange portions 12,13 which provide journals for a pin l l,-whichextends across between the flange portions 12,13 and secures the end of a toggle link 15. v

An actuating handle 16 is provided, pive oted at 17 in bosses 18,19, which are mounted with rivets, or other suitable mechanical connections on the outwardly extending flange portion 6 of the clamping aw. The handle 16 is linked to 1% link 15 with a pivot 19.

When thehandle 1G is moved in a counterclockwise direction, as indicated at Figure 3, the toggle links composed of the portion of the handle 16 between the pivot 17 and the pivot 19, and the long toggle link 15, move toward straightened out position, thereby causing the upper end of the contact jaws to be firmly pressed together so that good sur face contact between the inner surface of the jaws and the outer surfaces of the blades of the cartridge fuse is established.

The cartridge fuse for which I have provided this special mounting comprises a body 20, through which the resistance element passes, and having caps 21 from which extend the blades 22.

In actuating my improved fuse contact base, the handle 16 of the clamping device is opened out at each end, as indicated in Fig- 5 ure 3. The fuse is then inserted into the clamping jaws, and when the handle 16 is pressed to the left, as shown in Fig. 3, the toggle links straighten out, causing pressure to be exerted against the upper end of the 9 clamping jaw. This causes firm surface engagement between the inner surface of the contact jaws and the outer surfaces of the blades with the fuses. To release the car- I tridge fuses, the clamping devices are rocked b to the right, as indicated in Figure 3, and the cartridge fuse may be readily removed.

Vhile I have only shown one particular type of blade clamping jaw, and while I have only shown one. particular type of 0 clamp, it should be understood that niechani cal variations in the particular type of the clamping device rests withinthe scope of.

my invention. It should further be understood that other methods for reinforcing the clamping aws of the permanent mountings than by the use of an inclined brace, such as is indicated at 9 in Figure 3, might be employed. \Vith the simple construction which I have 0 illustrated, the increase in cost of the fuse contact base is so slight in proportion to the economies permitted that the construction is capable of widespread commercial use.

Having thus described my invention, what 5 I claim as new and desire to secure by Letters Patent, is

l. A fuse cut out base having spaced pairs clamping devices comprisin toggle links with a lever handlesarranged to straighten out said toggle links after the insertion of the blade of the fuse.

2. A fuse cut out base having spaced pairs of contact jaws, and having clamping devices associated with one of the'jaws of each pair for insuring uniform surface bearing of said jaws on the sides of the blades of a knifeblade contact type cartridge fuse, and said clamping devices comprising toggle links with a lever handle arranged to straighten out said toggle links, said clamping devices being arranged at the sides of the jaws.

8. In a knife blade contact type cartridge fuse mounting block, a pair of spaced contact aws having permanently mounted clamping devices associated therewith for clamping. said jaws together after the insertion' therein of the blades of a cartridge fuse, said clamping devices arranged to exert clamping pressure close to the open ends of said jaws, and said clamping devices comprising toggle links, one of which is extended to provide a handlefor straightening out said toggle links, thereby exerting pressure to clamp said j awe-together.

4. A fuse cut out base having spaced pairs of blade contactjaws, one of, each pair of jaws having a link pivoted at right angles to thejaws adjacent its outer end, and a lever pivota ly connected to said link, said lever being pivotally mounted whereby a portion of said lever forms a toggle link with said 7 first noted link. g

' 5. A fuse cut out base having spaced pairs of blade contact jaws, with means permanently mounted at the sides of said jaws for clamping said jaws together after the insertion of said blades, said means comprising toggle links.

enoaenn. WADSWORTH. 

